Blog
The Radio Access Network (RAN) is the connection point between user devices and the wider mobile network. In 5G and private 5G environments, the RAN supports everything from smartphones and IoT devices to industrial machines, sensors, autonomous systems, and enterprise applications.
Because the RAN sits at this critical access layer, security testing should go beyond a basic configuration review.
5G RAN security testing should validate whether authentication, encryption, integrity protection, traffic policies, interfaces, configurations, and management controls work as intended. For enterprises deploying private networks, this becomes an important part of private 5G RAN security.
This guide explains what security teams should test, why each area matters, and how organizations can structure a practical RAN testing program.
RAN security testing is the structured evaluation of the Radio Access Network to identify and validate security weaknesses across its infrastructure, interfaces, configurations, and controls.
A comprehensive assessment can cover:
For private deployments, private RAN security testing should also consider how RAN infrastructure connects to enterprise IT, OT, IoT, edge, and other business-critical environments.
Matrix Shell's RAN Security Testing service covers 2G, 3G, 4G, 5G, VoLTE, VoWiFi, and Open RAN deployments, with testing focused on authentication, encryption, integrity protection, and traffic policies.
The RAN is not simply a wireless connectivity layer. It provides an access path into the broader network.
Weaknesses in the radio layer can potentially contribute to:
For this reason, 5G radio access network security should be validated through structured testing rather than relying only on documented configurations or vendor security claims.
The first step is understanding what is actually deployed.
Security teams should map:
The objective is to establish the complete RAN attack surface before technical testing begins.
This is particularly important for private 5G RAN security, where RAN infrastructure may connect directly to enterprise applications, IoT systems, industrial networks, and edge infrastructure.
Authentication is one of the fundamental controls in RAN cybersecurity.
Testing should determine whether:
Weak authentication can create opportunities for unauthorized network access and should therefore be included in both vulnerability assessments and controlled penetration tests.
5G radio security depends on appropriate protection of communications over the air interface.
Security teams should validate:
Testing should focus not only on whether encryption exists, but whether it is correctly implemented and consistently enforced.
Encryption helps protect confidentiality, while integrity mechanisms help detect unauthorized modification.
Testing should verify whether:
This forms a core part of 5G RAN security validation.
5G base station security should receive dedicated attention because the base station provides the radio access point for connected devices.
Testing can cover:
The assessment should identify whether the base station introduces unnecessary exposure into the wider network.
The gNB is central to 5G RAN deployments, making gNB security an important testing area.
Security teams should review:
The objective is to determine whether security controls are correctly implemented at the gNB and whether weaknesses could affect connected systems.
A RAN vulnerability assessment focuses on identifying potential weaknesses across the RAN environment.
It may include:
Vulnerabilities should then be classified according to technical severity, exposure, business context, and potential operational impact.
RAN penetration testing takes testing a step further by using controlled techniques to determine whether identified weaknesses can actually be exploited.
Depending on scope, testing may examine:
Penetration testing should be carefully scoped and conducted in a controlled environment where possible, particularly when testing production telecom infrastructure.
Matrix Shell identifies traffic policies as one of the key controls validated during RAN security testing.
Testing should determine whether:
Weak traffic controls can affect both service availability and network stability.
RAN infrastructure requires management interfaces for administration, configuration, monitoring, and maintenance.
These interfaces should be tested for:
Management interfaces should never become an overlooked entry point into the RAN.
RAN components increasingly rely on software, virtualization, and cloud-based infrastructure.
Testing should therefore consider:
Software and firmware reviews are particularly important in modern virtualized and disaggregated RAN environments.
Open RAN security requires additional attention because disaggregated architectures can introduce multiple components, vendors, and interfaces.
Testing should consider:
O-RAN security should therefore be assessed as part of the complete architecture rather than testing each component independently.
Matrix Shell includes Open RAN deployments within its RAN testing scope and specifically addresses security validation across modern disaggregated RAN architectures.
Common private 5G RAN vulnerabilities may include:
The actual risk depends on the deployment architecture, configuration, technology, connected systems, and business use case.
A structured 5G RAN testing process can follow:
1. Discover → 2. Map → 3. Assess → 4. Test → 5. Remediate → 6. Retest
Identify RAN assets, gNBs, interfaces, management systems, software, and connected environments.
Document communication paths, trust boundaries, and RAN-to-Core connections.
Review architecture, configurations, authentication, encryption, integrity, and access controls.
Perform controlled technical testing and vulnerability validation.
Address identified weaknesses according to risk and operational priorities.
Confirm that remediation has effectively resolved the identified weakness.
For broader laboratory-based telecom testing, Matrix Shell's 5G Security Lab provides controlled testing capabilities covering protocols, APIs, interfaces, configurations, and vulnerability identification.
Organizations should incorporate these private RAN security practices:
Effective 5G RAN security testing should go beyond vulnerability scanning. Security teams need to validate whether the controls protecting authentication, encryption, integrity, traffic policies, management interfaces, gNBs, and RAN-to-Core communication actually work as intended.
For enterprises, private 5G RAN security should also account for the devices, IoT systems, edge environments, and IT/OT infrastructure connected to the network.
A combination of RAN vulnerability assessment, RAN penetration testing, configuration review, control validation, and retesting provides a more complete view of RAN security posture.
As 5G and Open RAN architectures continue to evolve, regular 5G RAN testing can help organizations identify weaknesses early, validate remediation, and maintain a more resilient radio access environment.
